Spinning reels are used for light weight lures that can be easily casted.  They solve the problems of the backlash since they do not have a rotating spool to go beyond and destroy the line  These reels are open-faced and allows the line to be released by flipping the bail.  Their reel body is either made of graphite, aluminum or plastic, and the strong ones are made of aluminum, although they are quite heavier than graphite or plastic.  Usually their sizes are dependent on what the fisherman desides to fish and the poundage of the line that they will be using.

For freshwater fishing, a ten pound test line is typically the strongest.  The number of revolutions the spool makes with exactly one crank of the reel handle relates to the gear ratio.  The gear ration varies on the size and the weight of the fish.

One of the necessary elements of a spinning reel is the drag since this keeps the line high strung with it's applied pressure.  The drag have either the front or the rear drag.  The durabele one with a good performance is the front drag, while the vulnerable one is the rear drag but is easier to control.

For the smooth texture, support and stability, spinning reels use ball bearings or brushings.  Spinning reels that perform depends on the number of bearing a reel contains.  The sealed stainless ball bearings are generally much stronger and with ease in utilizing rather thean bushings which are made of a simple set of metal lining.

Spinning reel also has a spool which holds the line and assists with casting distance and smoothness. These are made of aluminum or graphite. Similar to the reel's body, graphite is lighter and aluminum offers greater durability.  Two basic styles of spools are out in the market, internal  or skirted spool.  Internal spools originated way back and you can seldom see them in newer models. They have simple designs but you'll usually encounter tanlgle, while the skirted spools will diminish this problem.

A longer design, is called the long cast spool which is shallower in style.  This is commonly used for longer casts because it allows less line friction.  It has the disadvantage though since this counteracts the fast-reel action of a higher ratio gear, which needs majority of spooled line to perform in an effective manner.  You may also want to consider the spool's line capacity.